algebra word problem

Question

An image on a slide is similar to its projected image.
A slide is 35 mm wide and 21 mm high. Its projected image is 85 cm
wide. To the nearest centimeter, how high is the image?

Answer 1

Hello Lucy,

 

 

Since the images are similar, we can set up the proportional equation like this:

 

Slide width / Slide height = Projected width / Projected height

 

35 mm / 21 mm = 85 cm / Projected height (in cm)

 

Projected height = (85 *21) / 35 = 51 cm

 

 

Hope this helps,

 

Megan